Puzzle-solving and exploration were a lot of fun. Combat turned out to be more annoying than anything. I had a particular bone to pick with the little ghost guys, who I found to be far too tanky for my tastes and fast enough to be annoying. The grappling hook was a lot of fun, and using it on the chest was a cool moment. The first two levels were very well designed, though I felt the third was less so. Restarting the entire dungeon after you die felt excessive. Final fight of the third dungeon was obnoxious. 

I only noticed a few bugs/technical errors:

• tile in the bottom left of the 2nd to last room of the first dungeon seemed to be transparent

Pretty fun, if flawed.