Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
Overall, I enjoyed the hack, though I probably spent a good 50-70% of my total playtime on Trust Issues and Boys Don't Cry.
I quite disliked the former level; it's a bare-bones ghost house level that, as the name implies, is full of red herrings. The end result is that the player winds up playing through the same segment several times entering doors at random until they find the correct one, which isn't fun. I got the feeling Robju didn't realize that sending the player all the way back to the beginning when they entered an incorrect door was tantamount to death.
Boys Don't Cry, meanwhile, isn't a bad level in itself, but it is considerably harder than any other level in the hack. I will say that I didn't like dying by missing the same cheap fuzzy/sawblade jump repeatedly in the first half, though the second half mostly eschews cheap obstacles even as it retains the first half's difficulty.
I may post a more complete review later.
shoot I've got my first gameover before being able to save the game. The third level was too hectic for me :'(
Anyways, from what I've seen, good use of vanilla, nice palettes and music, I'd even say you developed something fresh. Good job.