strategy (normal)
early as possible get sniper. upgrade reload til it's costing about 12k. Get autolaser for wave 15. Pump damage to about 1.8x for wave 17 (on this wave use sniper for greens and autolaser for else). While getting a little interest and saving cash generally. After level 18 go back to fulltime sniper til level 28... very boring but most effective. Buy about level 4 armour piercing for level 25. For level 28 spend the >1 mill cash you should have saved up, I had about >500 max hp, 5 damage multiplier, maxed reload, 7 ap level, max regeneration, 13% interest. It's autolaser as main weapon from now on, easier for grey stars, Just get enough damage boost on it to take bullets out in 2 hits and coast through til level 35, where you go back to sniper and, except for level 39, use it for the rest of the game.
The superior strategy though is not to waste your time on this one, game has very weak gameplay and is all about hitting on the right upgrade strategy.
Making the last 4 levels essentially the same is a bit cheap.
g-y-g-g-g-y|g-g-g-y-g-g L22
g-g-g-y-g-g|g-y-g-g-g-y L23
y-g-g-g-y-g|g-g-y-g-g-g L24
g-g-y-g-g-g|y-g-g-g-y-g L25
Nice to see a dev catering to the mindlessly retarded community. The rest of us would probably be more interested if the game had a game mode other than 'absurdly easy'. 'Ever so mildly engaging and only barely afkable' would be a healthy improvement, for example.
The problem here is that the greater diversity in block shapes ensures errors are almost always a lot more localised than in LoZ, where your 2 loose ends could have to 'move' across the entire board to fit into the right place. It does look damn pretty though. Perhaps one added addition in the veins of the grid would be being able to hold down a key for shapes with unconnected ends to be highlighted, when you can't see the loose end on a larger map.
3rd boss very hard, the delay after using a skill means it's pretty impossible to avoid attacks. You can double tap l+r for a while to survive but sooner or late you'll get trapped by forming blocks. Skill descriptions could use work.
as with pretty much all of these melee platformers, just mash to win. Only difficulty comes from bosses and that's only a brief bit of pattern recognition. nicely polished but homogenous weapons and simplistic fighting 3/5