Grim retro visuals and music give the game a unique atmosphere, which I really enjoyed. The gameplay felt somewhat lacking, however. Enemies are mostly just annoying and pose no real challenge, and most power ups have no significant effect on the gameplay. I'd suggest adding a bit more depth to the game's fight system, for example by having smarter enemies with telegraphed and deflectable/blockable attacks or adding some extra dangers for the player to look out for such as projectile shooting traps.