im playing it very well on an acer pc... i cant see the problem... maybe your specs are very low?? what cpu/gpu and how much ram do you have??
open your task manager (using ctrl+alt+del) and go to the performance tab... there you can check how much memory ram you have available and how much are you also using already... and youll also can check for which cpu model do you have and which gpu model (if you have any... some pcs doesnt have a gpu) do you have... once you get that info then i should be able to know if is better than my pc or worse... if is worse than mine then both of usll know why isnt working the game for you... but if is better than mine then maybe is because youre playing it via browser... the game's autor (fisk) recommended us (the players) to play the downloadable version instead of from the browser for better performance... actually... if dont want to share that info tho... try that last thing (downloading the game) first... if it doesnt work neither then try to play it on another pc instead...