A beautiful small metroidvania.
On my first run I had fun exploring the dungeon, but when I noticed that the upgrades could be collected in any order, I had much more fun finding the optimal path. The challenge didn't come from beating the game but from beating it quickly. However, if that was the goal of the game, it could have been implemented better (for example with a timer on screen or a reward for a low time). In contrast the belt and the helmet are really useful only on your first run.
Also I liked how the combat can be strategic if you want to complete the game without deaths.