Hmm that's strange. I don't have this issue on my side. Can you try on a different browser/device?
Viewing post in Pokemon-Like Tutorial Kaboom.js comments
yeah, worked as I switched to a newer one (I dont like the just-released versions to try, so I waited) ...but on that similar to Firefox, it was playable. Cool. Nice style and graphics do remind me of gen1, maybe the sky or water surrouning that cube to battle on there - could be quite animated with either clouds or waves?