This is Rob, the sole member of Moon Jelly Games. I've been developing CATACLYSM for the last few years with many long gaps in productivity due to school work. With university behind me, I've been able to get the game to a state that I can confidently and proudly call "finished", though I expect I'll still tweak things here and there, especially if I start getting some good feedback.
Believe it or not, I came up with the game before I even played the game that inspired it (TowerFall)-- I had only heard people talk about it on podcasts. I wanted to create my own take on that sort of simple, yet exciting local multiplayer arena battle gameplay. Since starting development, I've discovered numerous games with a similar spirit including Samurai Gunn, Starwhal, Duck Game, and Inversus. If these games are your jam (and they should be-- they're awesome), then you should give CATACLYSM a try.