That's strange, it's working fine for lots of people.
Could you please tell me what OS you're using? Is it Windows, MacOS or Linux?
And what is the browser?
Unfortunately, we could not reproduce the issue :(
Probably it is caused by high quality sprites that we use in the game and some machines with integrated Video Card has lack of memory to correctly work with them through WEB version.
Could you please give a try to the downloadable version of the game?
Some people who had faced this issue told us that there were no issues when they run PC build.