I think i did not get fully how the upgrades work. The art with the music makes me tense lol, and think a big thing is coming up. The slow paced type of the shots contribute to this tenseness of the vibe. This is terrifying, great work
The upgrades strengthen the respective projectiles in either their size, speed, damage or number of projectiles. Glad you like the tense atmosphere. Thank you for playing and giving us feedback.