This build is actually almost too easy, I even managed to beat the last level at my first attempt (thank you, shield;-)
I am still experimenting with the new generation system, so the difficulty level might flunctuate between builds until I find that sweet spot! 0.3 is more difficult because I kind of set loose one of the variables for generation. 0.2 is easy because the system was allocating "difficulty points" for unimplemented features.
Anyway, the biggest issue is that it's auto-deletes the game.
This is a known bug - if I recall correctly, it's not deleted, but you have to restart the game for the menu to appear. I'm looking into fixing it now.
It's also funny that every attack that makes use of arms... (may we call them EXP for "EXternal sPawners"? JK, but we should eventually think of some cool names or acronyms for the game's elements) so what I wanted to say is that any attack which uses those, generated patterns which have been easier to dodge than any attack which didn't. It also messes with my head a little when I'm required to dodge something that comes from underneath me.
Be prepared for 0.3 arms then, they are harder and less restrained (but not impossible like those 0.1 ones)! They are still quite experimental at this stage though.
It would be great to have some kind of an indicator so you can see how long each of the two phases will durate so for the sake of estimating the risk of getting closer while it's not shooting. My suggestion here is to use the same visual element that's used for the shield, maybe just in the boss' or any other color than white to avoid confusion.
That's a cool idea - though I want the player to gauge and learn the boss pattern by themselves :)
Another not build-specific thing you most likely already know but I'd like to put here anyway is that the left and right sides are not really used. I'd like to see some stats there, or at least the layout of the level selection as a ~70% faded background.
I'm planning something for those sides, so stay tuned! One side will probably used as a score/completion indicator, while the other side is for flair/decoration.