I think the only thing holding this back is there are only 2 enemy types and a boss and no enemy mixing. But I understand you can only do so much as a team of one and you'd rather start on the next chapter rather than keep coming back and only tinkering with this. I'm definitely excited to see where our bunny goes.
Thanks! And I agree it is a bit sparse, but in addition to what you already said, remember this is essentially 1/5th of one game, rather than 1 of 5 games. The parts will be released and play separately for practical reasons, but it's very much planned as one thing. So the "whole game" eventually will have a pretty good variety of enemies, we're just not there yet.