I forgot to write in the manual that you can press MATH to run and x^-1 to stop running. 

Would it be possible to add the possibility to save anywhere in the first level? The level seems incredibly huge and I get lost easily, running out of bombs and dying eventually before I can finally save, so I had to restart from almost the beginning everytime I wanna test.

Also how do you attack the alien? He's immune to everything...

Have you tried using Y= and WINDOW to switch between players?  The alien can be attacked with Jamie's fire and Collin's ray gun.

Also, do you mean that you run out of "grenades?"  If you actually run out of "bombs" instead of "grenades," that's a bug I need to fix, since you're not supposed to have access to bombs until the next save point.

I'm not sure yet I want to add the ability to allow players to save anywhere during the first level, but if that first level is proving too difficult, maybe I should reconsider it.  That is what this "balance testing" is meant for, after all 

EDIT: I was able to gain some extra space for a few more tiles after optimizing everything, so I'll add a couple of "save points" in the map.  At least then you can walk up to those points to save your game.

Ah yeah I meant grenade. My bad. The issue is not really the enemies being hard to beat, though, but rather that the level is very large to be done in one sitting.

Yeah, good point. I was hoping to have something like the Legend of Zelda for the NES, where you can save your game but have to start from the beginning cave every time you start the game up. Or Shovel Knight, where your game will save only after you complete a level. I stand by that choice for some of the later levels, but maybe I should make an exception for the first level. 

@DJ Omnimaga  Thank you sooo much for testing the game and sharing your thoughts!

I think I've come up with a good solution that will take into consideration what you said without having to do a lot of reprogramming and / or breaking any saved games you may have created.  What I'll do within the next 4 days is make it so that whenever you collect a bomb, mineral, etc. your game data will save but not your location.  At least in that case, if you have to start from the beginning of the level, you don't have to go back and recollect everything.

For level 1 in particular, I can make it so that your game will re-save once you walk past the corridor that doesn't let you pass because you don't have enough bombs.  Then, if you die, you don't have to start at the very, very beginning of the level.  And every time you collect a bomb, you can load your game at this new save point knowing you don't have to collect that same bomb twice.

This should also help address my concern that perhaps levels 9, 10 and 11 are too difficult.

Sorry, I have been busy with a secret personal project in the last two weeks so I didn't get to try the new version yet. I downloaded it, though, so I can try to beat it during breaks.

That's it!  The critical bug has been fixed, I'm happy with the changes, and I'm saying that, from my end, It's balanced enough unless other people think differently!  But it's still an early release build.