The music is awesome. Did you compose it yourself? If not then: well chosen. It' really long and goes hand in hand with your game. Really nice. Good job! The art is cool, although I do not like the tumbling spaceman with a cowboyish rifle. The rotation is not needed, the really cool comet does not need it, too. So, why not draw some alien enemy or other space threat on paper like you did with the comet.
The game idea is cool. Place ...erm... weapons on the moon to defend it. You have to buy them and place them. Here we run into game fun issues:
- "Gray out" stuff that you cannot buy, because price compared to money you have waaay up to the top-right is not something you get in the first seconds. Then you click around, nothing happens and you wonder WTF...
- After buying, the weapon wanders around in its cage. It seems to be some cage, because you cannot drag it to the left directly. You have to move it upwards then left then lower it on the moon. This is really annoying. I would remove this hidden barrier left of the cage.
- The weapons are way to cheap. After buying the first one and placing it on the moon, money floods in fast and buying and placing new weapons becomes a matter of taste for color and visual composition rather than a defense strategy. This from me, a guy who likes forgiving, easy games, I must say this is way to easy and leaves you with no challenge whatsoever.
- The different weapons should also be much more different - more like a narrow laser with lots of damage power, some normal blubb blubb gun (like the green one) and some radial blaster master that hits pretty much everything in some radius but only damages a bit, etc. And then more powerful weapons should cost MUCH more. And vice versa: If it costs MUCH more, it has to make BOOM MUCH more. In many defence-games the weapons are like "a bit stronger" or "a bit faster", but IMO that's not the fun. It's cool if the player has think what weapon they need and may have to wait to afford the cool Whimseybooper3000, then there is strategy going on, tickles their IQ and give satisfaction if the plan works.
- FYI: After Wave 25 the demo ends silently. That's fine. You could have displayed a "DEMO END", but yeah, it's also fine like this. It's a demo, all good.
So, please keep working on it. The idea is cool. Just... make it cooler. I already had a happy time playing, particularly because of the music and the graphics. There is potential here. Go shoot it!