Evil Cluster is by far one of the easiest bosses to deal with in the game, as its attacks are not particularly difficult to dodge.
Its regular attack patterns consists of:
At its 60% HP Marker, Evil Cluster will perform a sweeping attack across the bottom of the room, flying from the left side of the room to the right. To avoid getting hit, players should jump over or dash through Evil Cluster as it flies across.
At its 25% HP Marker, Evil Cluster will perform 2 sweeping attacks spanning the entire height of the room, flying from the left side of the room to the right, and then from the right side of the room to the left. There will be a gap in its attack on the side it flies out from (gap on the left when it flies from left to right, and vice versa), and players should ideally stand in the gaps to avoid getting hit. Alternatively, players may try dashing through the purple laser Evil Cluster fires while flying across.