Nice little game !
My feedback:
Problems:
-there is a little bug with the boxes, if you put one in the way of a door and you close it, the door closes and it just ignore the box (it should stop on the box and stay a bit opened)
-I didn't understand what are the things you collect for, maybe need a tuto or more suggestive UI ?
-the first animation when the door opens it a bit long at the end.
-there are some slowdowns (I suppose the objects are loading, optimization issues, maybe caused by the fact I ran it in browser)
Good stuff:
-the design is nice and cute
-the puzzles are satisfying and the "secrets" have that feeling where you fell smart when you do it, so well played there
-the controls are good, and a very good point, I'm french and the controls (azerty keyboard) fit, no remap to do thanks so much :')
-the idea to make the tongue controls not just in front of the char but in 4 directions (separate from the char movement) is good
-didn't try with a gamepad but the controls seems nicely placed
So good start, with polish it can be a good game, now you just need to keep going and fix/polish things !
And try to earn some visibility, I think that's the hardest part, do you have a steam page ?
Anyway I wish you the best, I think your game can be successful !