I have a semi major bug to report, its probably less the fault of the dev and more of the engine and my computer though.
If you play on an bad PC and you have frameskip active, once you enter the third room in the Swamp camp brewery (where the barrels are), the game will register Beltboy and the party moving but won't actually draw it on the screen. This makes it impossible to get through the barrels in the area, so if you have a shittier rig like I do, TURN FRAMESKIP OFF!
Otherwise you wont be able to progress unless you can see with your ears or have godlike patience.