This was my first game jam so a lot of basics, but I think I learned more this past 2 weeks (also entered the Brackeys jam) than I have in the many months I've been learning before! The thing I spent the most time on was character movement, and getting it to feel fair when you die rather than feeling like the game was screwing you over.
P.S. just played your game - I love the mechanic of evolving to adapt against what killed them. The whole thing feels very Zerg-like.