难度选项（Modular Difficulty）
Islets 在常规的"简单 / 普通 / 困难"之外，还提供更细的辅助 / 挑战滑杆。这些选项在开始新游戏时选择，也可在暂停菜单的"Options → Difficulty"中调整：
受击伤害
可调
减少/增加 Iko 受到的伤害
攻击输出
可调
提高/降低 Iko 与箭矢的伤害
敌人血量
可调
辅助向会让小怪更易击杀
弹幕密度
部分模式变化
飞艇空战和后期 Boss 弹道更复杂
存档、检查点与死亡
- 检查点：每个岛屿都有若干"小床"式存档点，靠近躺下即存档。
- 死亡：在地面 Iko 死亡时，会从上一个存档点复活，没有任何资源惩罚（不掉魂、不扣钱、不丢升级）。
- 飞艇战：空战时命中的红圈位置亮起，方便你在弹幕中找到"安全区"。失败后从战前最近存档点复活。
- 通关后 Boss Rush：通关解锁 Boss Rush 模式，记录"无伤通关"和"困难无伤"两条独立成就。
通关时间参考
以下为 HowLongToBeat 的中位数据，个体差异较大：
主线
约 7.5 小时
中位 7h 13m · 平均 7h 38m
主线 + 支线
约 8 小时
中位 7h 52m · 平均 8h 14m
全收集（100%）
约 9.5 小时
中位 9h 19m · 平均 9h 35m
Steam 全成就
约 8–10 小时
包含 44 个成就
全成就 100% 包含通关主线、Boss Rush 三档（普通 / 困难 / 无伤）以及"全升级 60 个"、"全付费门"等支线要求。
适合的玩家类型
- Metroidvania 新手：节奏温和、死亡零惩罚、平台跳跃不刁难。
- 剧情向玩家：NPC 故事线丰满、支线信件多，调性温馨。
- 全收集玩家：60 个永久升级 + 5 道付费门 + 隐藏区域，重复游玩价值高。
- 挑战型玩家：困难 + Boss Rush 无伤可玩出搏击感。
- 轻量玩家：每天 1.5 小时、约一周可通关。
Modular difficulty
On top of the standard Easy / Normal / Hard modes, Islets exposes sliders that fine-tune your run:
Inbound damage
Adjustable
Reduce or increase damage to Iko
Outbound damage
Adjustable
Buff or nerf sword / bow output
Enemy HP
Adjustable
Lower for an assist feel
Bullet density
Varies by mode
Airship and late bosses get denser
Save points and death
- Checkpoints: Every isle has several bed-style save points; interact to save.
- Death: Iko respawns at the last save with no resource penalty — no soul / money / upgrade loss.
- Airship fights: A small hitbox is highlighted, so you can find safe pockets in the bullet-hell. On defeat, you restart from the last ground save.
- Boss Rush: Unlocked after the main game; tracks separate "no-hit" and "Hard no-hit" achievements.
How long to beat
HowLongToBeat medians (with averages):
Main story
~7.5 h
Median 7h 13m · Average 7h 38m
Main + extras
~8 h
Median 7h 52m · Average 8h 14m
Completionist
~9.5 h
Median 9h 19m · Average 9h 35m
All Steam achievements
~8–10 h
44 achievements
100% includes finishing the main story, three Boss Rush tiers (Normal / Hard / No-hit), all 60 upgrades, all five paid gates, and several hidden checks.
Who is it for?
- Metroidvania newcomers: gentle pace, no death penalty, fair platforming.
- Story-driven players: rich NPC vignettes and letters in a wholesome tone.
- Completionists: 60 upgrades + 5 paid gates + hidden nooks for high replay value.
- Challenge hunters: Hard + Boss Rush no-hit for a focused run.
- Casual players: ~1.5 h per day over about a week finishes the main game.
资料校验：References checked: HowLongToBeat · TV Tropes · TrueSteamAchievements