oh thats so weird O: you could also try restarting your computer and making sure you have no other programs open while you play! my laptop is pretty laggy with most games so making sure nothing else is open helps me usually! im very sorry for the issues ;3; if you still want a refund i hope you can contact your bank about it, im sorry itchio doesnt really do refunds as far as im aware ;-;
another fix could be either playing it windowed or playing it full screen! whichever youre not doing, try the opposite!