Played it on Twitch yesterday, and has a great time.
Obviously lots of work went into this entry. The map's huge, the graphics are nice, the music is especially good IMHO, and the controls feel tight enough for all the platforming / battle to be enjoyable. There even are two different endings :O
What more is there to ask? Well, here are some clue about where to go next. Add gamepad support (I think this is already working in the post-jam version). Add a bit of juice here and there, e.g. frame freezes on hits go a long way to make things feel more dynamic. The lasers near the end lack a bit of anticipation for my own taste. And maybe find a way to entice players into looking for the seeds a bit more actively. But all of this is whipped cream on top of an already very solid jam game.
Well done, keep on making cool stuff like this!