If you want to be perfect, here are some of the changes that need to be made:
All Synchro monsters:
"One" -> "1"
All spellcaster monsters:
"Spell-Caster" -> "Spellcaster"
And a handful of minor grammar issues here and there, for example "attack","attacks","inflicted","inflict","has","have". Watch when you need to use singular/plural verbs and present tense/past tense!
Here are some of my comments on particular cards:
LOK-0003 Ayu TsukimiyaSpecial summon tuner = lol, Skill Drain/Forbidden Chalice also reverts the attack and defense of the summoned monster.
LOK-0017 Rin Natsume"Rise" -> "Increase"
LOK-0020 KomarlionYou can use pixiv to find a less pixelated image.
LOK-0023 Riki Naoe's RoomEffect can be rephrased to: "All face-up Level 6 or lower monsters on your side of the field gain 100 ATK and have their levels increased by 1 for each face-up monster on your side of the field."
Summon a level 2 tuner and a level 2 monster and you already have a level 8 synchro!
LOK-0027 Go Explore!You don't tribute spells. Replace it with "You can send this face-up card to the graveyard to..." The final condition can also be replaced with "During the end phase of your turn, destroy the summoned monster."
LOK-0029 GAME START!Special Summon from where?
LOK-0031 Bag of SnacksSkill drain, Final attack orders, giant trunade = whoaaa
LOK-0033 Akiko's Special JamLet's say you drew 3 of this during your first turn. 64000 LP lol.
LOK-0036 Space ParadoxRemove from play using which method? Top of the deck?
LOK-0039 Aozora"Rise" -> "Increase".
LOK-0040 Here Comes Fuko!I declare Des Frog Croaking!
Will continue later.