Finished with a 408k score. Great presentation, smooth gameplay, no rough edges. Not that I expected anything less considering the quality of your previous jam games.
I didn't find the steal mechanic particularly impactful (rather it felt like an extra step to getting a power up), and the player character felt on the slow side. I'd have appreciated a somewhat faster speed, maybe with a focus/slowdown button? Either way, neither of these things affected my enjoyment much.
Only complaint is that some hitboxes felt off. Either certain bullet hitboxes felt too big, or I couldn't get used to player char's hitbox (which I think could pop off more, it wasn't very easy to see). For example, the rotating atom-like bullet - the one on your first gif - is it just the middle that can hit you or also the rotating bits?
Overall - very polished, pleasant to play. Didn't really notice the theme being used because I always powered up anyways. Not much else to add. Congrats on finishing the jam!