Caught another glitch. Fun game though.
This is a really fun concept that is easy to grasp and easy to play. Now I just think you need tweak a few things to make it a little more playable.
A major problem I had, (and I realize that I can't blame you for this) is that I kept intuitively wanting to use 'shift' to switch guys rather than 'space' and I kept on restarting the level instead. I do think you should make the level reset button a little less accessable (like the R key for instance) that way it is less likely for someone to accidentally restart the level and in their frustration just quit the game.
My penchant for accidental level restarting however did cause me to find a few glitches in the game. For instance whenever I accidentally restarted a leveI I noticed that all of the coins re-appear AND I keep the coins I had already collected, meaning I could get an infinite ammount of them in almost any level.
A major problem though was found in the tutorial level when I got one of my men up to the flag and went to switch to the other to bring him up. Of course I had actually hit the restart button (being the haphazard player of games that I am) and found a glitch of major proportions. It seems my characters were floating in the air above their start point cycling through every character animation. Aparently this proved too much for my work computer (which admittedly isn't the greatest) and crashed my browser.
Glitches alone however, do not necessarially kill a game. This is a very fun game and is worth playing, however I do think you should work on improving the fluidity of the game. I am by no means a programmer and may not be able to put this in the proper terms, however I will use for an example the 'boost' used throughout the game. The only way the boost works is if you are stopped, facing the ledge you wish to ascend, and then you jump while holding forward. This is perfectly fine, however it does begin to feel a bit stiff. You are not able to run and jump into the boost, and if you are accidentally facing the wrong way you cannot turn and grab the ledge. Having to go through the rigid action of stopping, boosting, and climbing every time (even though it only takes seconds) does break up the flow. Take a look at the early videogame successes (mario, sonic, etc.) and you realize they are based on fluidity and speed whereas the failures (elevator action, E.T. ) were blocky and slow.
As I said before, it IS a good game, and I did have fun playing, I just think a bit of improvement could make it a classic.