Very ambitious. I like the concept. And I can kinda look past the sprite clashes. However, my main issue is as a player. The balancing is very, very bad. It feels like the developer knew this, and gave the players 999 lives rather than try to better balance the game (either make enemies drop more healing items or some kind of player health leveling, which I have seen done in other OpenBOR games). More annoying things occur than challenges, things like enemies jumping out of the way at the last minute, player attacks have little to no range on the Z or Y axis, meanwhile enemies can hit you out of the air even when their weapons aren't near you. Not to mention the bug I encountered where a boss didn't show up and softlocked me, and with few checkpoints even in early levels, I had to start the level from the very beginning.
Again, I can appreciate the ambition and love the concept. But it was poorly executed and has too many rough edges.