Lovely game. Really had me engaged until the end. I just wanted to know what I would unlock more and what else would be there.
I think it may also be caused by the cute dog barking ... that just made me smile every time.
And I love how you made a metrovanian, but without all the searching what direction you needed to go. It was just pretty linear - so it was easier to know what to do.
The haunting ghost-like enemies killed me a bunch of times ... but for the rest it was pretty chill game.
And the music was just perfect. The relaxing music above the water and the muted music below ... very well done.
Only thing I had trouble with was at the beginning ... I had no idea where to go ... so I almost quit because I figured you just had so little time that you could only add a house and the outside. It was more a desperate move that I jumped into the water - expecting to die ^^
And last but not least, the final unlockable (won't spoil it for anyone) really but a big smile on my face.
Great work!