Great game, here is my attempt to make a small guide for new players
Enemies
Enemies can spawn from any of the four corners of the screen. Do not touch them.
Basic enemies
Spawns every 3 seconds with random direction and speed. When it leaves the screen, it reappears on the other side.
Smart enemies
The first one spawns at 20 seconds, it’s fast and targets the player as it spawns; when it leaves the screen, it reappears in the same place it left.
Explosive enemies
The first one spawn at 28 seconds. It tracks the player and quickly explodes with 4 spikes going diagonally in all four directions.
Power-ups
F (freeze)
This power-up lasts 5 seconds and freezes all enemies in a small radius around the player. (nb: explosive enemies will explode even when frozen).
B
this powerup lasts only 3 seconds and destroys all enemies in a small radius around the player (nb: if you destroy an explosive enemy, it instantly reappears where it appeared)
S (speed)
This power-up lasts 10 seconds and allows the player to go very fast. The timer also goes faster !!!
Synergy
You can stack the power ups, here are the possible combinations:
F + B
F + S
S + B
F + S + B
the best combination is S+B, because it’s the best way to reduce the number of enemies that accumulate on the screen.
B+F is useless; the freeze power up is eclipsed by the B power.