Thanks! How far did you get?
Can't remember exactly how far, but I got snagged in an area where the first key is on the left side, the second key is on the right side behind a locked door, and a red guy blocks the way down. I plan on taking another crack at it.
Just out of curiosity, how did it end up with such a big file size?
I tried to build the levels like puzzles, so it's important which order you do things in. The red blocks are demons. They have the same health as the player so you'll need to attack them then go heal and come back to finish the fight. I think the file size comes from Construct 2/Node webkit files. The actual game assets are almost nothing. The song takes up the biggest chunk.