kinda strait forward
But as patdbgt said below, about half the time when you level up and you choose +20 seconds, it only gives you 10 seconds. I could have gotten a lot further if it worked right.
Too bad The-EXP is lowing the grade. Latest games are a bit... uninteresting. The game could be hard but interesting. Your latest games have only the first parameter. Too bad...
no more can be said
The level-up screen is a buzzkill. Okay, you get to see it less and less frequently over time, but it still ruins the atmosphere, by interrupting the action, whenever it pops up. Maybe it would be better to choose which upgrade you prefer by pressing a key on the keyboard would be better.
Other than that flaw I find it a rather solid and enjoying game. Nothing much to say about graphics, sound and gameplay, they do their job but there's nothing really notable in them.