As I've stated elsewhere, don't bother buying this game at full price. There are almost always 90% coupons available for this game through the Coupon Dumpster steam group (please be sure to follow all rules and guidelines when asking for coupons through this group). This is not a full walkthrough, but I've added a few pointers.

W/S: Left and Right
Space: Jump
Press or Hold L Shift: Shoot

This game has pretty basic platformer mechanics. The only tricky thing is that the jump height is fixed, which means that getting through some parts requires jumping and then moving while in the air to get under spikes, or jumping and holding W or S.

Unless you are just trying to dodge enemies, holding L Shift and moving around is the best strategy. The farther you get, the harder it is to dodge enemies. You can shoot enemies while they're offscreen, so do that as much as possible.

You have 3 hearts of health. Enemies and spikes both deal a half heart of damage, but will damage continuously, so you want to avoid touching them as much as possible. Hearts can spawn offscreen and don't disappear, so try not to grab them unless you've taken at least a heart of damage.

These aren't too bad to get, being more tedious than difficult, if anything. However, I have included some pointers.

Clear levels 1-4. These are very easy levels.

Clear levels 5-9. You can pretty easily get away with dodging enemies and running for the exit.

Clear levels 10-14. Actually killing enemies becomes more important in this set, although you can usually kill enemies for half the level and then run for the exit.

Clear levels 15-19. For these ones, it tends to be faster in the long run to kill every enemy, isolating enemies to kill them as much as possible. Be sure to kill enemies while they are offscreen when you can. This also works for the flying enemies (especially in 17) if you jump up and down while holding L Shift. Don't be afraid to backtrack to a platform that is safer to jump around on to kill enemies, especially flyers.

Finding the exit on 19 is a bit tricky. Head up and to the right, jump to the right on a couple long platforms, then drop down at the end of the long platform once you reach a series of cubes that descend. Head left over the spikes, jump to the far left wall, then jump down and to the right (there is a platform you can't see).

Play the game for an hour. This is NOT total time played; it must be within a single play session. Just start the game and let it run for an hour; don't minimize the window or try to do anything else. You can check the length of your current play session using the Steam overlay (Shift + Tab). Once it has been at least 61 minutes, close the game. This achievement does not seem to display while you are playing, but it should be there when you check Steam.

I hope that you have found this guide to be helpful. If you have; please leave it a like and a favorite. If you feel anything is missing or incorrect, please leave a comment. Thanks!