I really liked this game, and I am proud to provide the 20th rate =)
My main problem with the game was that things were very unreliable. Turrets had quite a bit of spread, and didn't aim perfectly at you (dunno why, but I exploited that to easily beat the boss). Another unreliable thing was boxes, sometimes they'd swivel and rotate and other times they'd behave as expected. Consider locking the rotation of the boxes, or perhaps forcing them to move in a grid. Objects also shouldn't be able to come off of the ground. If you shot a box, it could (sometimes) go up a bit and hit elevated turrets. The isometric view was occasionally annoying but for the most part made for interesting limitations, since you couldn't shoot diagonally.
Overall, the game was really good, if only it were to be more reliable, you could create some awesome puzzles. At the moment, the puzzles feel a tad janky, because the pieces don't always do what you want them to. The art was amazing, and I think the game's thumbnail severely undersells how cool this game is (likely a reason why you've got so few ratings). Congrats on your game, I wish that more people would play it!