As I do see other people mentioning here: The art is killer, The gameplay not so much.
Let me just prefice by repeating myself and very much meaning it: THE ART IS KILLER.
But the gameplay... The gameplay mainly lacked engagement. I'm not gonna sit here and offer you the solution I think is right to that problem since I do not know what your vision is, and really the only way a game will feel like a complete and unique game is by following someones vision otherwise you could incorporate literaly all the suggestions in these comments and still come out the other side with a more engaging yet frankestein-like uninspired mess of a game.
generally my advice is search for engaging game loops, especialy dumb easy fun ones if you're more of a begginer like me, every game I've made that I saw clearly people enjoying had a clear dumb fun concept to play around with, such as "blow stuff up", "kill a buncha lil guys" and so on.
This game was rather ambitious in it's concepts: "Big map exploration", "Warioware/pizza time style get back to the start concept", etc'. But it seems you cooked so hard on the graphics side you simply neglected gameplay and theme along the way.
Would love to see more stuff from you, just stuff that'll keep me engaged for longer and that'll have more care put into the gameplay side of things