Nervous good game, but the in-game purchases

The game is a typical jump-run game, but the in-game purchases are already necessary in order to advance.
So you Requires approx 20 - 30 attempts in the first level to have earned an upgrade.
I myself have the first level nocg failed because the alien spaceship at the end of Levelns apparently is getting faster.
I think therefore the upgrade to the successful completion will be nötig.
Since I have made very bad experiences with ingame Käufen, I tend to prefer full-price games to buy in the game Pyramid.
In my view, in the long term any cheaper.