So, I got into these types of games not long ago and found I love them. Here's what I have so far.
Nex Machina - Probably one of the best I've played.
Matterfall - Considered the worst of Housemarque's titles, but I find it fantastic. I guess people just couldn't get used to the controls.
Enter the Gungeon
Riddled Corpses - Just bought this. Weird game but I like how it looks and it's fun so far, only I can't get past stage 2. It's not because of bullets flying everything, but rather the zombies enemies and critters are everywhere and taking up space and you lose a life from just touching them.
Airheart - I haven't played this yet but it looks really interesting.