First of all, thanks for playing our game.
Yep, the modules could use some work, sword modules are pretty much only damage increase and a change in the shape/area of the attack. The dash is actually pretty broken once you get used to it, but the shield is underwhelming. We hope to improve the modules and add more bosses and modules in the future.
The boss paterns are pretty simple, yes. We didn't have much experience with boss rush games, so we drew a lot of inspiration from Hollow Knight/Mega Man. While Hollow Knight does have deeper bosses with múltiple phases, Mega Man bosses are simpler (at least the ones I'd played). I checked some Mega Man games I'd played a long time ago to check how the bosses were made, and to my surprise, they were actually really simple design wise. I remembered them being really fun, yet watching them now on video, they just had a set pattern they repeated over and over. So I drew from that, and while all the boss patterns are ours, the simple desgin was based on Mega Man's. You could say our game took inspiration from Hollow Knight to design the character movement, and from Mega Man to design the bosses. We could definitely add more depth, like phase changes on certain health thresholds, enrage timers, etc. There are a lot of options.
Thanks a lot for your feedback we're glad you enjoyed it!