It gets a little dull in the back-half once you've collected all the powerups but the first chunk is enthralling and delightful~

A very nice little platformer/metroidvania style exploration, however, I have encountered a massively gamebreaking bug, when dying in the lower area of the first maps. A death int he lava created a condition where i viewed a room that has a missile tank and refused to let me do anything else.

This is great! The fun and depth of exploration is totally on par with the Metroid games. The controls feel really good, even on a keyboard. And the music rules.