The main game is very fun and well made, but the precision part in the secret ending feels very out of place. Your hitbox is strange, because only your bottom half (or whatever) counts as a hit, and the boundary of this hitbox isn't clearly indicated. Then, your bottom half hitbox feels too large. It seems very frequently like I will die to those yellow vines without really having stepped into them, and then I'll remember "oh, actually I can stay higher because that bullet won't kill me if it hits my head". Generally, the precision platformers/bullet hells that I enjoy have more generous hitboxes.
Edit: I sure will.