Pretty fun game core and appealing art style. Enemy design is lacking a bit, e.g. the drill enemy's attack is very fast, not telegraphed and with too big of an interval too feel the rhythm of. Since you can only (at least for the time I've played) in melee, he's pretty annoying. Another one - the yellow guy who hides underground for too long. Not dangerous, but takes annoyingly long time to defeat.
TLDR fun game with some not-so-fun enemies.