Sweet game! The multiplayer element is a nice touch, and helping each other out could have some interesting implications. How would you tackle points for example, and does someone 'win'?
Thanks!
When an alien reaches the bottom of the screen, it's Game Over for everyone. So the rule is: cooperate or die.
Singleplayer-wise, it's a bit close to Plants Vs. Zombies - I don't think you'd be wanting to compete with them if you could avoid it! So if you did decide to go further with the game, I'd look at adding enemy types and situations that haven't cropped up in other lane tower defence games yet. Especially interesting could be enemies that wander across lanes, becoming a threat to different players as they did so. Or waves of enemies that suddenly concentrate on just one friend, causing everyone to pitch in and help him as much as possible.
I agree 100% on all points.
As a single-player game, it's not much more than a shameless clone, but I'd hoped to grow it into something more interesting on the multi-player side. I like the tension between protecting your own lanes and helping your neighbours protect theirs.
The big downside is that I don't know if an audience really exists for Wi-Fi multi-player Android games...