Yes, generally. However, because Vercel allows anyone to deploy code, malicious users could theoretically upload harmful scripts. Stick to the "best" list above or repositories with high GitHub stars (100+). Avoid any Vercel game that asks you to "download a player" or "disable adblock."
Safety Checklist:
These are the best places to start if you want a massive selection of games in one place. vercel app games unblocked best
When searching for Vercel-hosted games, specific genres work better than others on browser interfaces: Yes, generally