It's happened too many times and it's beyond frustrating. Anyone that's played the game jam version can vouch that there is a big problem with the spacebar not registering.

But that's mostly fixed in the newer version but there's still instances where I've lost a run because the game didn't register that I pushed it down.

It isn't a problem with me releasing the spacebar because I've tried multiple times. Anyone else ever have this problem?

YES. Switching to 1.1 made most of it stop, but it can still be finicky. I’d recommend to make sure you land for a tiny bit before tryin to jump again, as the collision can be weird. Pressing harder on the space bar, and keeping it held down (as you say you’ve done). If you are holding down a direction right after you land can make the game think you are still airborne, especially if you’re moving towards an edge.

So you think maybe releasing A/D when I land and am about to jump again may help?

Hopefully, I’ve found just waiting a tiny bit when ya land helps in all versions for consistent jumps