Nice game.

However level 40 doesn't record the stars.

Level 34 took about 50 attempts to finally get it down and that was all luck (I suggest going for explosions first as that was how I finally did it).. Level 26 again relied on luck with the lighting bolts hitting the coins enough to take them out. so those two levels could use a second look at (I'd suggest make 34 a tiny bit smaller so its not quite so large)

The half star loss is because of that level 34 tuning and level 40 stars not working ;) A little bit more info on what upgrades do would be nice but not really needed imo.