You successfully improved Space Invaders:)) I absolutely loved the game! Maybe if you could rotate the Tetris pieces, it would add more depth to upgrading skills, as you'd have to figure out the most effective way to place them. Also, slightly increasing the speed at the start of the game and reducing the speed boost from upgrades might work better. I really enjoyed it! The last level took me a few tries, but I had a blast finishing it.
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yep, the grid wasnt as well done as i wanted it to be... i havent done much "puzzley" stuff so i had trouble setting it up. by the time it was working i didnt want to mess with it and wanted to move on to other stuff. definitely would want to make it more substantial in a full scale project. i kind of hated the movement speed too in a way, but there are only so many speeds the player can go at a fixed framerate and "real" pixel graphics without the thing jittering and stuttering. as a bonus i felt like it forced the player to focus more on strategizing and shooting accurately providing a bit of variance in play. and if they didnt like it the upgrade was cheap so i was like meh whatever. gradius 3 does the same thing where it starts you out unbearable slow but the first easiest thing to upgrade is speed, so its sort of like a blatantly correct choice mechanic. also the final speed upgrade was over the top lol. i forgot that you couldnt undo that and just choose to not upgrade it. maybe i should take a hint from your game and add a "sell" mechanic lol. thanks for the feedback/play!