I'm sorry that Ultron and Droid Assault haven't done well, but they're both twin-stick shooters that aren't playable using a gamepad. That's an initial turn off for many hardcore fans of the genre.

I can't speak for Ultron because the demo (not available on Steam) won't run on Windows 8, but last time I tried Droid Assault, it took a while to pick up in difficulty. I didn't encounter much challenge until near the end of the (rather long) demo.

Droid Assault was also pretty easy to exploit; the first few boss enemies won't chase you off screen, so it was possible to pop in and out of hiding, firing off a few shots at a time. This makes for boring gameplay, but the game didn't discourage it.

The games don't seem to be aimed at hardcore gamers, and they're not popular with casual gamers. Who is Puppygames target audience?