Probably the biggest regret I have is that we (as in my team) failed to account for a difficulty-nullifying exploit that can be performed in the game. I don't want to say how to perform the exploit because I still want people to enjoy the game for how it was meant to be played. Thankfully, though, the exploit is something that is completely under the player's control (once they realize they can do it), so it's not like the game forces them to perform the exploit, if you see what I mean.
Here's our game! https://charliechumbuck.itch.io/thevengefulorb