i will play simu games if

- multiplayer (more players)

Definitely the on-chain game is multiplayer.
In fact, every address will represent a player.

- an in-game items purchases +bonus to first purchase, (upgrades items, skins etc. this will create demand)

Yes, there will be something like that, but on a grander scale.

- ONLINE COMPETITION
- Players can send coins to each other (with fee for the prize pool and to avoid new account spams)

Yes, that's just a consequence of using the SIMU currency in-game, that alone will allow both those things.

simulation games is also good since you named it simu

like sims or vrchat.

Yes, the cool thing about SIMUgames is that we can create many different kinds of games and host them from within a "STEAM"-like interface.