Good one-night-stand, has potential for more depth
Overall pretty good, a fun and reasonably satisfying 20 minute time waster.
If you are happy with it as a casual one night stand (and its fine if you are), then consider the game a success and ignore everything below
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If you ever feel like making the game more longer and more in-depth, then the following issues should be looked at:
==Obvious things==
1. It's currently too short and easy to make for a good in-depth game. This might just be me, but I managed to beat the entire thing in about a half-hour with no prior experience and dying exactly 2 times in the game, both to the final boss.
2. The weapons are also not very well differentiated, and I suspect that it makes no real difference which ones are bought aside from "more expensive = better". It is a nice touch to have the player deal with things like cooling and weight, but in practice I found that I didn't have to think about either one in the slightest, save for that one time that I foolishly equipped my mech with all PCBs (but beat the mission on the first try anyway, see point 1).
==Non-obvious things==
(bugs, glitches, irritating things, etc.)
3.(Minor) It would be nice to have a better description of the weapons in the shop. For example: what is the difference between a laser and a cannon?
4.(Minor) In the shop, maybe consider having weapon data appear to the side of the button, and not fade out until the cursor is moved away. This would make it easier to compare the stats of multiple weapons.
5.(Moderate) I personally found the controls to be less than ideal. It could just be a matter of opinion, but I found it hard to simultaneously press things like WASD+TAB, or WASD+TAB+SPACE.
6.(Moderate) Keys occasionally get "stuck" while playing the game, although I don't know if that is just me. (Ex: After holding and releasing "up", the mech might continue to move up until the key is pressed again.
7.(Moderate) Your bullets land at the position of your cursor, rather than flying off the screen in the direction of your cursor. I appreciate this functionality in shoulder missiles, since it allows me to explode them at strategic positions to take advantage of their blast radius, but the fact that bullets do the same thing prevents me from ever shooting at things off-screen. This causes problems because some enemies actually *do* appear to be able to target me from off-screen, it also makes targeting enemies while moving needlessly difficult.
I think the best way to deal with this would be some sort of key combination like alt+arrowkey, that would pan your screen a few feet in that direction, and then alt+[something else] to recenter the display.
8.(Minor) It might be a good idea if "retry" put you at the mech-equipping screen rather than restarting the mission. This would make it easier to try different combinations of guns.
9.(Glitch) It is possible to lock on to and fire on enemies off-screen by holding down fire and moving your mouse outside the game window. I actually am not sure yet whether this should be considered a glitch to be fixed, or a unique and interesting gameplay element to be preserved. Sort of like in real life; firing artillery into the unknown in hopes of hitting something important.
10.(Advanced) If you are really dedicated to this game, and feel like a challenge, then allowing user-created maps / mechs / weapons could increase the replay value of the game without bogging you down in creating new content. The easiest way would be to simply let the game read a text file (having the user paste it into a form field would be sufficient) and parse it into a level, or a custom mech, or what have you. Google something like "reading a game map from a text file", or "user created content in flash games" for ideas.
