Oki Doki...

Points:

delidog:
23 E's = 46 points.
5 I's = 10 points.
Total points = 56.

Casper & Kitty:
13 A's = 26 points.
2 U's = 4 points.
Total points = 30.

Puzzle:

---- a--e- --e -a-- --ee -a- -ee- -u- ----, ---- a--e- --e -a-- -i-e- -a- -e- --i---e-, ---- a--e- --e -a-- -i-- -a- -ee- -au---, ---- --e- -i-- --u -i-- --a- ---e- -a---- -e ea-e-. ~ --ee -----e--

Available letters:

BCDFGHJKLMNOPQRSTVWXYZ