Love the title art! Game is great too! One question, are the lights supposed to go out in some rooms? Sometimes things would get extra dark and the foreground tiles (cave walls, etc) would disappear. At first I thought it was a bug but then I noticed a small 'light switch' sound going off whenever that happened.
Controls were sharp also, which was good because some of the levels do require precision movement.
Full of lots of nice little touches, like the names scaling up as they disappear in the credits, etc.
My one quibble would be with jump being mapped to UP. Using a face button for jump generally works better since it's easy to accidentally push up when moving the joystick left and right. On the other hand, using UP to jump was a staple of games from the era this game clearly takes inspiration from, so maybe it just makes it more authentically retro. :)