Looks interesting and fun, but clicking Start gives me a frozen background with the gun not moving, but still making sound effects when I push the buttons to shoot.

A very solid game you got here dude. Very retro and oldschool. But i love it. One complain is how damn hard it gets haha. But then again - it might be just me sucking at these type of games.
Looking forward to see more from you

Not a bad game, and definitely has potential. The two things I found the most annoying were the slowness of the turret and the lack of a continuous shot. I would try to shoot two enemies, but it would take my turret a while to get there, and then I had to click again.

Reasons for my rating:
Music: 1/1 _____________________(Music suites the game)
Gameplay and interface: 2/2.5 ______(Good game play, but gets a bit repetitive after a while, theres
a point where it suddenly gets hard)
Graphics: 1/1.5 ___________________(Good graphics, but nothing really special)
Glitches: 0/-1 ___________________(No glitches were found)

However there are still some improvements that could be made, and maybe a few features you could add:

-When you get an upgraded laser (double green), disable the chances of the other type of lasers
appearing (because I went back to single blue which got me killed).
-Allow different control settings (in case people want to switch firing to other stuff).
-Maybe let turrets that you pick up to be permanent but you reduce the amount of times you get them by
alot so it makes them more useful on a long term basis.
-(Suggestion) Maybe add an upgrade system at the end of every wave in which you could add one point
to a certain attribute Here are a few ideas to that:
-Luck: The chances of things appearing such as a turrets or
Bombs, shields etc...
-Damage/Shots: Amount of bullets you shoot, the damage of
each bullets.
- Hit points: How much hp you have. (Or you could set the game
into 100 (Does not necessary have to be 100 with the
specific damage done.) hit points in your ship and each
enemy does a certain amount of damage 5,10,25 etc...
and make it that each enemy drops money at their
death and you can use that to buy stuff).
- Armour: Reduce damage from each enemy (This would only
work if you're using the 100hp system with the different
damage from each enemy.

Solid game. Gets intense preety fast. One thing i would like to see are scores being visible when i play not just after the game when i die. Would feel more rewarding.
i banked 11003 scores. :P