This is a really fun game, and having been able to play this game from its beta stage to its proper release and seeing how far you have taken it since its original stages and graphics I can honestly say this is the best build yet and the most fun out of all of your previous games.
If you haven't played this yet, or have and have not come across the 'Space Invader' or some of the other air support options trust me when I say it will make you smile and laugh when you get them.
Also the way the drop zones for bombs, shields etc varies is good so it stops people hanging in one area and adds to the skill side of things, can you get across without taking a hit.
The slot machine with its bonuses is a good touch too, however regardless of how may times I've used it, I've never had more then 2 out of 3 on it... I'm just glad its not real and I'm not putting in money or I'd be in debt by now.
The hidden game isn't that bad but you know all the love and effort has clearly gone into the main game (which is a good thing).
The only reason I can't put a 5 out of 5 on this is because of the music. Don't get me wrong, it fits with the game, your clearly going for retro and the 8bit style music fits, its just annoys the hell out of me. There is nothing wrong with it, its just not to my taste and an option to play with sound effects but music muted wouldn't go a miss.