Hey thanks so much for checking it out! There is definitely a much better build coming within the next couple of weeks. Indeed, all of the technical problems you mentioned (swamp entry, tileset issues, enemy balancing, chests) have already been fixed for the next version, but thank you for letting me know. I actually am planning to rework the intro just a bit, to make it a little less tropey (it also blasts by at mach speed and you can't read anything at the end lol).
Thank you again, I'll be looking at Eremiel as soon as I get the chance :)