I haven’t tried that specific site, but Bad Ice Cream 2 definitely feels like a fun throwback to the Flash era, and it usually runs best on desktop because touch controls can be hit-or-miss. If you’re playing on mobile, try using a browser that supports full-screen mode and enable “Desktop site” to improve responsiveness. For tougher levels
https://aethersx22.com/ , focus on timing your blocks and using enemies’ movement patterns to trap them.