Wow, this is really impressive! It feels like an old arcade game, especially with the simple gameplay and controls. However, the tilted perspective gives it a really interesting visual touch.
The enemy designs also add a layer of puzzle solving, where you have to discover the enemy's weakness to safely damage them. Credit to the art for making many of them intuitive to figure out at a glance, like the shield-bearers, who I immediately figured to attack from the back (even if I completely failed in my attempt).
The after-level choice of health or points also adds a nice sense of progression, since player's are rewarded for surviving the challenge, but it also forces them to balance safety with greed - or get good enough to only need points, which is definitely the optimal strategy.
I like it! I think a lot of good was done here. Great work!