The water buff literally brutalized the last enemy. Without it I would have needed a lot of time despite having the strongest broadsword and all related buffs. 4/5 unless there is a sequel.
It took me a lot of time to beat the first (=weakest) boss with the second best weapon... Am I missing something? At least I haven't had any lag issue so far, which is great.
I had to pump extra power into my CPU in order to beat the boss, otherwise the lag made it unbeatable.
As for the game, you should be able to toggle what units to use or not.
It took me almost 50 days to buy enough items to score a 2x trick. Gladly I can now hope to forget about this as soon as possible.
Two quick tips: buy wheels, rockets and stunt moves - everything else is eye-candy or one-life only, meaning if you accidentally crash that item shall be lost forcing you to purchase it again (at higher price).
Smooth controls? No lag? Are you playing a different game or what!? Without any sound, lowered graphic and no visual effect for me it's a pain to play any level, especially those with a boss. Awful, 1/5