There is a bug with "Technology" purchases. I bought Tier 1 "Permanent Special 1" before buying anything else. I cannot buy anything else no matter what I do. I have tried resetting TP, buying a bunch of TP, resetting TP and then surrendering, etc. I am now up to wave 450+ and still have no technology other than "Permanent Special 1".
Just a few things:
1) There seems to be a bug with the "workshop" I am not sure if it is a unique occurrence, but I am level 21 and I cannot seem to keep my "gold ring" resource from deleting. I save up, purchase it, and then it disappears when I log off. This began when the alchemy "event" was released.
2) Adding a button to collect all vendors from resources might be useful.
3) Wonderful job with updates, add-ons, etc!! Thank you so much!
There is a bug in the last version that caused a loss of progress in some cases. This should be fixed with the newest update (2.4.4). Please try the new version, because it's very likely that your bug is caused by this progress loss.
In the start of the game you can buy the racing stripes to raise your speed. Then, just keep clicking it even though it's equipped and it will continue to raise your speed by 20 with each click. This will get you max speed, then you can use O for up K for left and M for down while training your reactions. Good for earning all the medals and achievements doing it this way. Have fun.
To get the awards for chains, points, enemies killed, and evasion. Use your beginning points on your firing speed and spread. Then, stay in the middle and play like you're a turret. This prevents you from leveling up and nothing but green and purple pixels will attack you.
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Do you meet both requirements as tooltip says?