Devlog 4 - Upgade System and Progression

Implementation
Another big update which introduces the card based upgrade system to the game, which gives progression to my game.
Upon leveling up by collecting XP orbs that enemies drop when killed, you get to select 1 card from 3 displayed. Each card has its own effect that it either applies to the player, player projectile, or is an activatable ability. There are a total of 13 cards, 3 Active, 2 AOE, 2 Damage, and 6 Passive. Cards are weighted so you will see some more than others. Collecting the same card more than once will keep adding its effect to the player, but for active ability cards, it will reduce its cooldown when collecting it again.
Here are the major changes for this build:

• Card based Upgrade System
• 13 cards total, each with unique effects
• Boss's health decreased, as player has been nerfed since they can now upgrade over time

An example of 3 cards upon leveling up

Known Bugs
Same bugs as last time, but also the game seems to start to lag once you get to around wave 25.

Feedback
Sadly no feedback was given for this build, but I believe I've done enough testing to make sure every card is balanced correctly anyway.