Wow thanks for taking time and giving thorough feedback.
You are right mana can definitely trick you into shooting it later in the run. More user feedback was something I started working towards the end of jam so I didn't really had that much time to playtest the game. Matching elements was my mistake, for some reason I thought that using opposite elements will make game harder since when the game gets to some length and there are many enemies it's easier for your brain to connect matching color then to think what element kills it. But it's something that needed testing for sure.
Congratz on 8th place :).