This is a fun game for a few bucks, but there are a few things I wish were a bit different.
My issues I have involve what happens after Pearl slams face first into something.
When Pearl get hit, she jolts and her velocity changes. This change in direction almost always leads her into another obstacle.
I think it'd be nice if this was either toned down or completely removed.
Oh also on that note, I'll assume that the flashing effect that happens after Pearl runs into something is supposed to be temporary invincibility.
If it is, I think it should last a little bit longer. As of the point of writing this, I think it lasts just less than a second, and different obstacles can spawn as frequently as a second, meaning the safe period will always run out by the time the next obstacle has arrived.
I would personally make it last a second and a half, maybe even 2 seconds. (It could be fun to link this to an item?)
I think this is just my way of saying that the game may be a bit too hard. I'd rattle off the issues with game difficulty (responsiveness, speed, hitbox size), but everything I'd say has already been said, so I won't waste your time.
Other than that, it's fun, if not a bit frustrating at times.