Here is the spreadsheet detailing the RNG distribution of enemies.
https://docs.google.com/spreadsheets/d/18JOu_LbxQfVieQXBKDWUaRnGwGVtIoTWaXB6AFGY7ys/edit?usp=sharing
For every enemy in the list, when it is drawn from the pool its instances in WOF are replaced by the one above it (or going back around from the first to the last). This makes distributions very uneven.
Here are some general tips and rules about purchase logic: -A £1200 strategy seems to be best. It requires collecting £800+ before the start of Level 3, using the banks on the way in 1, 2, 3, and the junk in 5. This strategy enables double buys in L3 with favourable patterns leaning towards the red enemies, saving more time. It also gives you backups for buying 2 enemies in L5 or even insurance for 7. -Your most likely first enemy in L3 is Green Batman. NEVER buy this outright. If you want to spin the wheel, go in the bank first, and kill the batman who may spawn in the cave above the invulnerability first, then buy. Following this, if you get Red Miner, buy it, that should really tilt you towards red enemies. -If a Black Rat comes up first, and you can reliably get in the shop quick enough to stop 4b95 within 2-4 slots of movement, do it and buy it. 25% of the time you get Green Batman and have a time loss. 9.4% of the time you get Red Batman giving good implied odds. 25% you get Red Rat which is highly favourable. 28.13% you get the Red Miner, also buy that then for a guaranteed Red Batman. (For Red Batman you need to load him by scrolling the screen sufficiently to the left, this takes practice.)
If the Grey Egg has already been collected, and you get Black Rat, you can stay in the shop and buy it, increasing Red chances.
Otherwise, generally, you want to collect Green Batman and hope for favourable deviations.
In Level 5, never EVER buy the worm. It leads to some really janky sequences. If you get a snail on your first few enemies, go right and see if he's there. If he's there, don't go in the bank. If he isn't there, go in for an extra £400, back, and buy. Always try to wait until the snail close/far situation resolves before buying here. If you know the last enemy is a far away one, feel free to buy it. For antelope you typically have to go outside and check he isn't local first, there's no easy way to tell except from very specific enemy patterns that you will begin to recognise.
In Level 7, if you have spare money, if your first enemy is the King Cabbage, always buy him. Always buy Hook, and if after Hook you get Quasimodo, buy him too. Do not buy Quasimodo then Hook, you screw up RNG that way. In L7 your odds are already stacked in favour of a nice ghost or toad, it's up to you whether to gamble on it being the closest one for a few seconds time save/loss.
