Damm, that was an impressively big one for a 30 day jam, well done!
Not only on size, but in quality too! the gameplay is super fun with cool mechanics, the graphics are simple but super stylish and the music also does a good job giving the neon vibes.
I really have no real complaints about this one, but not a lot to say about it either, it's just a very well made game.
(Quick Edit: I just remenbered a little nitpick I actually had: swapping to an enemy should give me a few i-frames. Sometimes 2 swappable enemies are either inside or too close to each other, so swapping to them actually deals some damage that feels kinda cheap)
Only thing I can say for sure that kinda screwed me up, was the fact the "New game" button is extremelly dangerous xD
Since there is no confirmation window when you click it and it just starts the new game instantly, I accidentaly deleted my entire progress once when I did a quick quit to warp to my last save point that was on the other side of the map. I myself didn't mind a lot since the game is very fun, and I got a chance to actually no-hit the first boss this way, but having to pick up all the upgrades again was certainly a little annoying, I'm pretty sure someone with less patience or less free time wouldn't have pushed throught to the end if this happened to them instead.
Anyway, here's me pogoing down the giant rectangle tower for no reason