I'll be completely honest here - the game as is has a few big issues that make it a bit annoying to play:
- it's not exactly clear what you need to do
- there's an instruction for "E" but I couldn't find what it does?
- I was not sure if the sword does anything or not
- there is no way to exit the game other than Alt + F4
- I was running around until I found a chest and finally randomly won
That said, don't let this discourage you! The music is quite nice, and I loved that going into the lava dropped you to a new level, giving you a good feel of discovery.