From the MiniGame website;

It's Space Invaders time again. But this time the bunkers seem to protect the invaders. Unfortunately, you cannot shot the bunkers. Fortunately the invaders destroy them very fast. :-) Simple graphics, no SFX, does the difficulty ever increase? Way too slow for the last invaders. / thrust26

Space Invaders in 1K, with nice graphics and progressively speeding aliens, great ! / Euphoric

Much better than may shoot-them-up released years ago by some companies. Fast and nice. / Symoon

Block Invaders. / Cybergoth

Nice graphics, though alien movement is pretty choppy. Starts easy and doesn't seem to get any harder? Lack of challenge doesn't help a well-worn game. / vdub_bobby

This is a reasonable implementation, but it is fairly tricky to to play on account of the small size of the invaders, their jerky movement and the slow bullets. / Matt_B