Had one more idea how to make this game also multiplayer.
Make online match-up 1v1 or 3v3 players,two team,random map and random enemies.
1v1- Wins player who clears map faster than other(no time limit)
3v3- Wins team, which total map clearence time is faster than others.
And of course ,what can you get if you win? Fiest player needs to buy in, for example 50 diams/500 gold/300 books from each player and winner gets 90% of pot.
I think you all got the idea
Your suggestions? ^^