I survived to level 3 and got to see some of the upgrade systems which was cool.
This game is well polished for sure here's what I liked and didn't like:
Gameplay loop:
This game is really simple and straightforward in its premise and a lot of things help bring that feeling of a bullet 'Heaven' the game doesn't take itself that seriously with the new wave tips (I found mostly fun lighthearted messages). As for actual gameplay I think the control scheme how bullets feel and sizing is all right on the mark for this game nothing feels out of place or generally broken.
Upgrades cards with a positive and negative sure does well towards making a dynamic build system for more playthroughs of the game so you can see them all. I do want to bring up the fact that it looks like each wave has a downside that will be in all of your options or nearly all, for example on my wave 1 upgrade screen I was forced to chose between the bad leaf downside or the schizophrenia downside which of the 3 options left me wanting more random downsides. This could be a lack of downsides actually available in the game or a problem in how cards are programmed to spawn. Either way upgrades/downgrades felt like they had a good impact on the game and nothing felt too overpowered or too punishing.
Art/Music style:
The art for this game is what made me want to play and review this game in the first place, Making simple sprites with hard outlines creates a unique style that is visually pleasing. Music wise this game has a synthy backbeat that isn't annoying to the point that if you listened to it on loop for awhile you would hate it. I would speak more on art style and direction but for the most part everything fit well into this game which made me think that the developer for Tinker Toy Tanks is either rather experienced with game development or this was team effort either way good job.
I don't have much else to say about this game as what it sets out to do is executed flawlessly and there isn't much critique I can provide. This game reminds me of something you would play for cheap or free on the Xbox 360's live arcade. I could see this game with maybe some more depth and expanded systems for the upgrade/downgrades being a full release on steam for a low price under $10.