It gets harder to level up once you have reached 300K score due to the fact that the next level is a whopping 100K score away.
So my suggestion is that allow us to convert coins into score.
But only if you have bought every single kit and upgraded it to the max. including perks.
If you have done that then you may convert your coins into score. 1 coin = 1 Score.
Just a suggestion. Same for TNTWars or any other games as a matter of fact.
This can be incredibly useful for those who are looking to level up and have no use of coins at all because they cannot spend the coins on anything.