I don't have all the collections in Deemo so I only went through the ones that I had. I have also made a playlist of these songs. This list is for any use that one may have for this knowledge in a run and just a place holder so we don't have to always check if this song is short enough. https://youtube.com/playlist?list=PL_TQ1vIg1LJTGAhHFiecNrgj7v2LI13am

The criteria I had for these songs is if it had the same length or shorter as Dream by Rabpit. Also I am only using the times of the song and not including the pauses in-game before and after completing the song. These are also rough estimates with possible human error in timings. (Name of collection)

Below 2 minutes:

1. Flight of the Bumblebee (Etude) 1 minute 13 seconds
2. Mirage (Sdorica) 1 minute 28 seconds
3. Hear of Witch (DJMAX) 1 minute 36 seconds
4. Kimi no namae no kazegafuku (Collaboration) 1 minute 36 seconds
5. 3piece JazzParty! (Taiko no Tatsujin) 1 minute 38 seconds
6. Rayark 7th Main Theme (Collab) 1 minute 38 seconds
7. The Black Case (Cytus Vol.1) 1 minute 41 seconds
8. Thief of the Gleaming Star (Sdorica) 1 minute 44 seconds
9. Flowers Above Your Head (Eshen Chen) 1 minute 46 seconds
10. Wickedfate (M2U x Nicode) 1 minute 47 seconds
11. Moon Halo (M2U x Nicode) 1 minute 49 seconds
12. No Gravity (Taiko no Tatsujin) 1 minute 49 seconds
13. Sea Side Road (Eshen Chen) 1 minute 52 seconds
14. Falling Ears (Eshen Chen) 1 minute 52 seconds
15. Entrance (DV) (Deemo's Vol.1B) 1 minute 53 seconds
16. Beyond that notes (Feryquitous #2) 1 minute 54 seconds
17. Fluffie Partie (N.M.S.T.) 1 minute 54 seconds
18. Let's Meet Here Again (Sakuzyo #2) 1 minute 55 seconds
19. Almost Morning (Eshen Chen) 1 minute 55 seconds
20. Platinum (Deemo's Vol.1A) 1 minute 56 seconds
21. Stellar (M2U x Nicode) 1 minute 57 seconds
22. Lune (M2U x Nicode) 1 minute 59 seconds
23. Anima (Deemo's Vol.2) 1 minute 59 seconds

To be completed.

These are all placeholders until proper titles will be found but these are what each room will be referred as for the time being. These are normally named by the community but as little to no runs are being submitted until more come in and the community interacts with each other more these are what we have for now. So this is really all up for public debate.

When identifying between the different style each room has the name will be proceeded by MS (Main Story) or FH (Forgotten Hourglass) unless the room is only added by the FH playthrough. These will have their own respective name.

(Order of these have no importance.)

1. Growing Hall (first play area at the beginning of the game)
2. Library (Room left of growing hall with the masked lady taking residence inside, this area should really never be entered in a run)
3. Painting Terrace (room right of growing hall with the illusionary painting)
4. Medal Stairwell (stairwell past the painting terrace with the medal on the ground)
5. Growing Sunroom (second play area past the medal stairs)
6. Living Library (lower Library found in the forgotten hourglass playthrough, this area should really never be entered in a run)
7. Lead Cross Section (room entered through the ladder in the growing hall)
8. Seeing Terrace (terrace area with the telescope on the left of the lead cross section)
9. Blossom Peerway (cherry blossom area entered through interacting with the telescope in forgotten hourglass playthroughs, this area should really never be entered in a run)
10. Family Stairwell (stairwell on the right of the lead cross section where Demo, The Masked Lady, and Alice always appear together)
11. Growing Stairwell (final play area where a gradually appearing stairwell takes the tree's place)

If you have access to a computer that is able to run an app called WonderShare MirrorGo and are able to connect a USB cable to both then that is one way. You can either capture the timer separately or with the MirrorGo window that will appear using OBS. That actually isn't what I think would be considered simple but that is what I found to be the best way for quality recordings, so far. If this doesn't work then you could try to find some posts that might help. Other than that I am afraid I am of no help, as I run an android. This might help but I am still ill-informed on the situation of iPhones so it might not. https://filmora.wondershare.com/screen-recorder/best-ios-screen-recorder.html#:~:text=Best%20iPad%20and%20iPhone%20Screen%20Recorder%20Apps.%201,4.%20Dr.%20Fone%3A%205%205.%20CoolPixel%3A%20More%20items