How would you describe the difficulty? Adjustable? Approx length of game?

Just coming back here to let you (the dev) know that I genuinely had fun with this game. Hope you're still working on new projects.

i only need this 2 achievements, please any description?

Everything's alright and fast up until about half health of the boss and I have literally no idea why but I literally get cornered every time cuz I'm teleporting.

its the 3rd secret weapon and I haven't come across it yet I don't think