Vampire Survivors

These are caterpillar mobs, you see 1-2 of them at the start of the 'Lake Foscari' map.

To get more - start the 'Lake Foscari' map, go to where the Seal of the Lake crystal is/was. Then go south alongside the right side a bit, there's a tree line on the right side that has spots where you can enter. Once you do, there's Sammies all over there.

If you've reached the right metaglo, you've gone way too far.